The Fluorescent Proteins YFP and CFP Emit Yellow and Blue

Multiple Choice

The fluorescent proteins YFP and CFP emit yellow and blue (cyan) light, respectively. These and other variations of GFP have been obtained through:

A) the chemical addition of yellow or blue fluorescent dyes to GFP
B) mutation of the gfp gene in specific sites
C) post-translational modifications of recombinant GFP
D) cloning gfp in different vectors
E) none of the above